/* m68k.c  All the m68020 specific stuff in one convenient, huge,
   slow to compile, easy to find file.
   Copyright (C) 1987 Free Software Foundation, Inc.

This file is part of GAS, the GNU Assembler.

GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.

GAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include <stdio.h>
#include <ctype.h>

#include "m68k-opcode.h"
#include "as.h"
#include "obstack.h"
#include "frags.h"
#include "struc-symbol.h"
#include "flonum.h"
#include "expr.h"
#include "hash.h"
#include "md.h"
#include "m68k.h"

#ifdef M_SUN
/* This variable contains the value to write out at the beginning of
   the a.out file.  The 2<<16 means that this is a 68020 file instead
   of an old-style 68000 file */

long omagic = 2<<16|OMAGIC;	/* Magic byte for header file */
#else
long omagic = OMAGIC;
#endif


/* This array holds the chars that always start a comment.  If the
   pre-processor is disabled, these aren't very useful */
char comment_chars[] = "|";

/* This array holds the chars that only start a comment at the beginning of
   a line.  If the line seems to have the form '# 123 filename'
   .line and .file directives will appear in the pre-processed output */
/* Note that input_file.c hand checks for '#' at the beginning of the
   first line of the input file.  This is because the compiler outputs
   #NO_APP at the beginning of its output. */
/* Also note that '/*' will always start a comment */
char line_comment_chars[] = "#";

/* Chars that can be used to separate mant from exp in floating point nums */
char EXP_CHARS[] = "eE";

/* Chars that mean this number is a floating point constant */
/* As in 0f12.456 */
/* or    0d1.2345e12 */

char FLT_CHARS[] = "rRsSfFdDxXeEpP";

/* Also be aware that MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT may have to be
   changed in read.c .  Ideally it shouldn't have to know about it at all,
   but nothing is ideal around here.
 */

void fix_new();
void install_operand();
void install_gen_operand();

/* Its an arbitrary name:  This means I don't approve of it */
/* See flames below */
struct obstack robyn;

#define TAB(x,y)	(((x)<<2)+(y))
#define TABTYPE(xy)     ((xy) >> 2)
#define BYTE		0
#define SHORT		1
#define LONG		2
#define SZ_UNDEF	3

#define BRANCH		1
#define FBRANCH		2
#define PCREL		3
#define BCC68000        4
#define DBCC            5

/* BCC68000 is for patching in an extra jmp instruction for long offsets
   on the 68000.  The 68000 doesn't support long branches with branchs */

/* This table desribes how you change sizes for the various types of variable
   size expressions.  This version only supports two kinds. */

/* Note that calls to frag_var need to specify the maximum expansion needed */
/* This is currently 10 bytes for DBCC */

/* The fields are:
	How far Forward this mode will reach:
	How far Backward this mode will reach:
	How many bytes this mode will add to the size of the frag
	Which mode to go to if the offset won't fit in this one
 */
relax_typeS
md_relax_table[] = {
{ 1,		1,		0,	0 },	/* First entries aren't used */
{ 1,		1,		0,	0 },	/* For no good reason except */
{ 1,		1,		0,	0 },	/* that the VAX doesn't either */
{ 1,		1,		0,	0 },

{ (127),	(-128),		0,	TAB(BRANCH,SHORT)},
{ (2+32767),	(2+-32768),	2,	TAB(BRANCH,LONG) },
{ 0,		0,		4,	0 },
{ 1,		1,		0,	0 },

{ 1,		1,		0,	0 },	/* FBRANCH doesn't come BYTE */
{ (2+32767),	(2+-32768),	2,	TAB(FBRANCH,LONG)},
{ 0,		0,		4,	0 },
{ 1,		1,		0,	0 },

{ 1,		1,		0,	0 },	/* PCREL doesn't come BYTE */
{ (2+32767),	(2+-32768),	2,	TAB(PCREL,LONG)},
{ 0,		0,		4,	0 },
{ 1,		1,		0,	0 },

{ (127),        (-128),         0,      TAB(BCC68000,SHORT)},
{ (2+32767),    (2+-32768),     2,      TAB(BCC68000,LONG) },
{ 0,            0,              6,      0 },  /* jmp long space */
{ 1,            1,              0,      0 },

{ 1,            1,              0,      0 },  /* DBCC doesn't come BYTE */
{ (2+32767),    (2+-32768),     2,      TAB(DBCC,LONG) },
{ 0,            0,             10,      0 },  /* bra/jmp long space */
{ 1,            1,              0,      0 },

};

void	s_data1(),	s_data2(),	s_even(),	s_space();
void	float_cons();

/* These are the machine dependent pseudo-ops.  These are included so
   the assembler can work on the output from the SUN C compiler, which
   generates these.
 */

/* This table describes all the machine specific pseudo-ops the assembler
   has to support.  The fields are:
   	  pseudo-op name without dot
	  function to call to execute this pseudo-op
	  Integer arg to pass to the function
 */
pseudo_typeS md_pseudo_table[] = {
	{ "data1",	s_data1,	0	},
	{ "data2",	s_data2,	0	},
	{ "even",	s_even,		0	},
	{ "skip",	s_space,	0	},
	{ 0,		0,		0	}
};


/* #define isbyte(x)	((x)>=-128 && (x)<=127) */
/* #define isword(x)	((x)>=-32768 && (x)<=32767) */

#define issbyte(x)	((x)>=-128 && (x)<=127)
#define isubyte(x)	((x)>=0 && (x)<=255)
#define issword(x)	((x)>=-32768 && (x)<=32767)
#define isuword(x)	((x)>=0 && (x)<=65535)

#define isbyte(x)	((x)>=-128 && (x)<=255)
#define isword(x)	((x)>=-32768 && (x)<=65535)
#define islong(x)	(1)

char *input_line_pointer;

/* Operands we can parse:  (And associated modes)

numb:	8 bit num
numw:	16 bit num
numl:	32 bit num
dreg:	data reg 0-7
reg:	address or data register
areg:	address register
apc:	address register, PC, ZPC or empty string
num:	16 or 32 bit num
num2:	like num
sz:	w or l		if omitted, l assumed
scale:	1 2 4 or 8	if omitted, 1 assumed

7.4 IMMED #num				--> NUM
0.? DREG  dreg				--> dreg
1.? AREG  areg				--> areg
2.? AINDR areg@				--> *(areg)
3.? AINC  areg@+			--> *(areg++)
4.? ADEC  areg@-			--> *(--areg)
5.? AOFF  apc@(numw)			--> *(apc+numw)	-- empty string and ZPC not allowed here
6.? AINDX apc@(num,reg:sz:scale)	--> *(apc+num+reg*scale)
6.? AINDX apc@(reg:sz:scale)		--> same, with num=0
6.? APODX apc@(num)@(num2,reg:sz:scale)	--> *(*(apc+num)+num2+reg*scale)
6.? APODX apc@(num)@(reg:sz:scale)	--> same, with num2=0
6.? AMIND apc@(num)@(num2)		--> *(*(apc+num)+num2) (previous mode without an index reg)
6.? APRDX apc@(num,reg:sz:scale)@(num2)	--> *(*(apc+num+reg*scale)+num2)
6.? APRDX apc@(reg:sz:scale)@(num2)	--> same, with num=0
7.0 ABSL  num:sz			--> *(num)
          num				--> *(num) (sz L assumed)
*** MSCR  otherreg			--> Magic
With -l option
5.? AOFF  apc@(num)			--> *(apc+num) -- empty string and ZPC not allowed here still

examples:
	#foo	#0x35	#12
	d2
	a4
	a3@
	a5@+
	a6@-
	a2@(12)	pc@(14)
	a1@(5,d2:w:1)	@(45,d6:l:4)
	pc@(a2)		@(d4)
	etc . . .


#name@(numw)	-->turn into PC rel mode
apc@(num8,reg:sz:scale)		--> *(apc+num8+reg*scale)

*/

#define IMMED	1
#define DREG	2
#define AREG	3
#define AINDR	4
#define ADEC	5
#define AINC	6
#define AOFF	7
#define AINDX	8
#define APODX	9
#define AMIND	10
#define APRDX	11
#define ABSL	12
#define MSCR	13
#define REGLST	14

#define FAIL	0
#define OK	1

/* DATA and ADDR have to be contiguous, so that reg-DATA gives 0-7==data reg,
   8-15==addr reg for operands that take both types */
#define DATA	1		/*   1- 8 == data registers 0-7 */
#define ADDR	(DATA+8)	/*   9-16 == address regs 0-7 */
#define FPREG	(ADDR+8)	/*  17-24 Eight FP registers */
#define COPNUM	(FPREG+8)	/*  25-32 Co-processor #1-#8 */

#define PC	(COPNUM+8)	/*  33 Program counter */
#define ZPC	(PC+1)		/*  34 Hack for Program space, but 0 addressing */
#define SR	(ZPC+1)		/*  35 Status Reg */
#define CCR	(SR+1)		/*  36 Condition code Reg */

/* These have to be in order for the movec instruction to work. */
#define USP	(CCR+1)		/*  37 User Stack Pointer */
#define ISP	(USP+1)		/*  38 Interrupt stack pointer */
#define SFC	(ISP+1)		/*  39 */
#define DFC	(SFC+1)		/*  40 */
#define CACR	(DFC+1)		/*  41 */
#define VBR	(CACR+1)	/*  42 */
#define CAAR	(VBR+1)		/*  43 */
#define MSP	(CAAR+1)	/*  44 */

#define FPI	(MSP+1)		/* 45 */
#define FPS	(FPI+1)		/* 46 */
#define FPC	(FPS+1)		/* 47 */
/*
 * these defines should be in m68k.c but
 * i put them here to keep all the m68851 stuff
 * together -rab
 * JF--Make sure these #s don't clash with the ones in m68k.c
 * That would be BAD.
 */
#define TC	(FPC+1)		/* 48 */
#define DRP	(TC+1)		/* 49 */
#define SRP	(DRP+1)		/* 50 */
#define CRP	(SRP+1)		/* 51 */
#define CAL	(CRP+1)		/* 52 */
#define VAL	(CAL+1)		/* 53 */
#define SCC	(VAL+1)		/* 54 */
#define AC	(SCC+1)		/* 55 */
#define BAD	(AC+1)		/* 56,57,58,59, 60,61,62,63 */
#define BAC	(BAD+8)		/* 64,65,66,67, 68,69,70,71 */
#define PSR	(BAC+8)		/* 72 */
#define PCSR	(PSR+1)		/* 73 */


/* Note that COPNUM==processor #1 -- COPNUM+7==#8, which stores as 000 */
/* I think. . .  */

#define	SP	ADDR+7

/* JF these tables here are for speed at the expense of size */
/* You can replace them with the #if 0 versions if you really
   need space and don't mind it running a bit slower */

static char mklower_table[256];
#define mklower(c) (mklower_table[(unsigned char)(c)])
static char notend_table[256];
static char alt_notend_table[256];
#define notend(s) ( !(notend_table[(unsigned char)(*s)] || (*s==':' &&\
 alt_notend_table[(unsigned char)(s[1])])))

#if 0
#define mklower(c)	(isupper(c) ? tolower(c) : c)
#endif


struct m68k_exp {
	char	*e_beg;
	char	*e_end;
	expressionS e_exp;
	short	e_siz;		/* 0== default 1==short/byte 2==word 3==long */
};

/* Internal form of an operand.  */
struct m68k_op {
	char	*error;		/* Couldn't parse it */
	int	mode;		/* What mode this instruction is in.  */
	unsigned long int	reg;		/* Base register */
	struct m68k_exp *con1;
	int	ireg;		/* Index register */
	int	isiz;		/* 0==unspec  1==byte(?)  2==short  3==long  */
	int	imul;		/* Multipy ireg by this (1,2,4,or 8) */
	struct	m68k_exp *con2;
};

/* internal form of a 68020 instruction */
struct m68_it {
	char	*error;
	char	*args;		/* list of opcode info */
	int	numargs;

	int	numo;		/* Number of shorts in opcode */
	short	opcode[11];

	struct m68k_op operands[6];

	int	nexp;		/* number of exprs in use */
	struct m68k_exp exprs[4];

	int	nfrag;		/* Number of frags we have to produce */
	struct {
		int fragoff;	/* Where in the current opcode[] the frag ends */
		symbolS *fadd;
		long int foff;
		int fragty;
	} fragb[4];

	int	nrel;		/* Num of reloc strucs in use */
	struct	{
		int	n;
		symbolS	*add,
			*sub;
		long int off;
		char	wid;
		char	pcrel;
	} reloc[5];		/* Five is enough??? */
};

struct m68_it the_ins;		/* the instruction being assembled */


/* Macros for adding things to the m68_it struct */

#define addword(w)	the_ins.opcode[the_ins.numo++]=(w)

/* Like addword, but goes BEFORE general operands */
#define insop(w)	{int z;\
 for(z=the_ins.numo;z>opcode->m_codenum;--z)\
   the_ins.opcode[z]=the_ins.opcode[z-1];\
 for(z=0;z<the_ins.nrel;z++)\
   the_ins.reloc[z].n+=2;\
 the_ins.opcode[opcode->m_codenum]=w;\
 the_ins.numo++;\
}


#define add_exp(beg,end) (\
	the_ins.exprs[the_ins.nexp].e_beg=beg,\
	the_ins.exprs[the_ins.nexp].e_end=end,\
	&the_ins.exprs[the_ins.nexp++]\
)


/* The numo+1 kludge is so we can hit the low order byte of the prev word. Blecch*/
#define add_fix(width,exp,pc_rel) {\
	the_ins.reloc[the_ins.nrel].n= ((width)=='B') ? (the_ins.numo*2-1) : \
		(((width)=='b') ? ((the_ins.numo-1)*2) : (the_ins.numo*2));\
	the_ins.reloc[the_ins.nrel].add=adds((exp));\
	the_ins.reloc[the_ins.nrel].sub=subs((exp));\
	the_ins.reloc[the_ins.nrel].off=offs((exp));\
	the_ins.reloc[the_ins.nrel].wid=width;\
	the_ins.reloc[the_ins.nrel++].pcrel=pc_rel;\
}

#define add_frag(add,off,type)  {\
	the_ins.fragb[the_ins.nfrag].fragoff=the_ins.numo;\
	the_ins.fragb[the_ins.nfrag].fadd=add;\
	the_ins.fragb[the_ins.nfrag].foff=off;\
	the_ins.fragb[the_ins.nfrag++].fragty=type;\
}

#define isvar(exp)	((exp) && (adds(exp) || subs(exp)))

#define seg(exp)	((exp)->e_exp.X_seg)
#define adds(exp)	((exp)->e_exp.X_add_symbol)
#define subs(exp)	((exp)->e_exp.X_subtract_symbol)
#define offs(exp)	((exp)->e_exp.X_add_number)


struct m68_incant {
	char *m_operands;
	unsigned long m_opcode;
	short m_opnum;
	short m_codenum;
	struct m68_incant *m_next;
};

#define getone(x)	((((x)->m_opcode)>>16)&0xffff)
#define gettwo(x)	(((x)->m_opcode)&0xffff)


/* JF modified this to handle cases where the first part of a symbol name
   looks like a register */

int
m68k_reg_parse(ccp)
register char **ccp;
{
	register char c1,
		c2,
		c3,
		c4;
	register int n = 0,
		ret;

	c1=mklower(ccp[0][0]);
	c2=mklower(ccp[0][1]);
	c3=mklower(ccp[0][2]);
	c4=mklower(ccp[0][3]);

	switch(c1) {
	case 'a':
		if(c2>='0' && c2<='7') {
			n=2;
			ret=ADDR+c2-'0';
		}
#ifdef m68851
		else if (c2 == 'c') {
			n = 2;
			ret = AC;
		}
#endif
		break;
#ifdef m68851
	case 'b':
		if (c2 == 'a') {
			if (c3 == 'd') {
				if (c4 >= '0' && c4 <= '7') {
					n = 4;
					ret = BAD + c4 - '0';
				}
			}
			if (c3 == 'c') {
				if (c4 >= '0' && c4 <= '7') {
					n = 4;
					ret = BAC + c4 - '0';
				}
			}
		}
		break;
#endif
	case 'c':
#ifdef m68851
		if (c2 == 'a' && c3 == 'l') {
			n = 3;
			ret = CAL;
		} else
#endif
			/* This supports both CCR and CC as the ccr reg. */
		if(c2=='c' && c3=='r') {
			n=3;
			ret = CCR;
		} else if(c2=='c') {
			n=2;
			ret = CCR;
		} else if(c2=='a' && (c3=='a' || c3=='c') && c4=='r') {
			n=4;
			ret = c3=='a' ? CAAR : CACR;
		}
#ifdef m68851
		else if (c2 == 'r' && c3 == 'p') {
			n = 3;
			ret = (CRP);
		}
#endif
		break;
	case 'd':
		if(c2>='0' && c2<='7') {
			n=2;
			ret = DATA+c2-'0';
		} else if(c2=='f' && c3=='c') {
			n=3;
			ret = DFC;
		}
#ifdef m68851
		else if (c2 == 'r' && c3 == 'p') {
			n = 3;
			ret = (DRP);
		}
#endif
		break;
	case 'f':
		if(c2=='p') {
 			if(c3>='0' && c3<='7') {
				n=3;
				ret = FPREG+c3-'0';
			} else if(c3=='i') {
				n=3;
				ret = FPI;
			} else if(c3=='s') {
				n= (c4 == 'r' ? 4 : 3);
				ret = FPS;
			} else if(c3=='c') {
				n= (c4 == 'r' ? 4 : 3);
				ret = FPC;
			}
		}
		break;
	case 'i':
		if(c2=='s' && c3=='p') {
			n=3;
			ret = ISP;
		}
		break;
	case 'm':
		if(c2=='s' && c3=='p') {
			n=3;
			ret = MSP;
		}
		break;
	case 'p':
		if(c2=='c') {
#ifdef m68851
			if(c3 == 's' && c4=='r') {
				n=4;
				ret = (PCSR);
			} else
#endif
			{
				n=2;
				ret = PC;
			}
		}
#ifdef m68851
		else if (c2 == 's' && c3 == 'r') {
			n = 3;
			ret = (PSR);
		}
#endif
		break;
	case 's':
#ifdef m68851
		if (c2 == 'c' && c3 == 'c') {
			n = 3;
			ret = (SCC);
		} else if (c2 == 'r' && c3 == 'p') {
			n = 3;
			ret = (SRP);
		} else
#endif
		if(c2=='r') {
			n=2;
			ret = SR;
		} else if(c2=='p') {
			n=2;
			ret = ADDR+7;
		} else if(c2=='f' && c3=='c') {
			n=3;
			ret = SFC;
		}
		break;
#ifdef m68851
	case 't':
		if(c2 == 'c') {
			n=2;
			ret=TC;
		}
		break;
#endif
	case 'u':
		if(c2=='s' && c3=='p') {
			n=3;
			ret = USP;
		}
		break;
	case 'v':
#ifdef m68851
		if (c2 == 'a' && c3 == 'l') {
			n = 3;
			ret = (VAL);
		} else
#endif
		if(c2=='b' && c3=='r') {
			n=3;
			ret = VBR;
		}
		break;
	case 'z':
		if(c2=='p' && c3=='c') {
			n=3;
			ret = ZPC;
		}
		break;
	default:
		break;
	}
	if(n) {
		if(isalnum(ccp[0][n]) || ccp[0][n]=='_')
			ret=FAIL;
		else
			ccp[0]+=n;
	} else
		ret = FAIL;
	return ret;
}

#define SKIP_WHITE()	{ str++; if(*str==' ') str++;}

int
m68k_ip_op(str,opP)
char *str;
register struct m68k_op *opP;
{
	char	*strend;
	long	i;
	char	*parse_index();

	if(*str==' ')
		str++;
		/* Find the end of the string */
	if(!*str) {
		/* Out of gas */
		opP->error="Missing operand";
		return FAIL;
	}
	for(strend=str;*strend;strend++)
		;
	--strend;

		/* Guess what:  A constant.  Shar and enjoy */
	if(*str=='#') {
		str++;
		opP->con1=add_exp(str,strend);
		opP->mode=IMMED;
		return OK;
	}
	i=m68k_reg_parse(&str);
	if((i==FAIL || *str!='\0') && *str!='@') {
		char *stmp;
		char *index();

		if(i!=FAIL && (*str=='/' || *str=='-')) {
			opP->mode=REGLST;
			return get_regs(i,str,opP);
		}
		if(stmp=index(str,'@')) {
			opP->con1=add_exp(str,stmp-1);
			if(stmp==strend) {
				opP->mode=AINDX;
				return OK;
			}
			stmp++;
			if(*stmp++!='(' || *strend--!=')') {
				opP->error="Malformed operand";
				return FAIL;
			}
			i=try_index(&stmp,opP);
			opP->con2=add_exp(stmp,strend);
			if(i==FAIL) opP->mode=AMIND;
			else opP->mode=APODX;
			return OK;
		}
		opP->mode=ABSL;
		if(strend[-1]==':') {	/* mode ==foo:[wl] */
			switch(*strend) {
			case 'w':
			case 'W':
				opP->isiz=2;
				break;
			case 'l':
			case 'L':
				opP->isiz=3;
				break;
			default:
				opP->error="size spec not :w or :l";
				return FAIL;
			}
			strend-=2;
		} else {
			opP->isiz=0;
		}

		opP->con1=add_exp(str,strend);
		return OK;
	}
	opP->reg=i;
	if(*str=='\0') {
		if(i>=DATA+0 && i<=DATA+7)
			opP->mode=DREG;
		else if(i>=ADDR+0 && i<=ADDR+7)
			opP->mode=AREG;
		else
			opP->mode=MSCR;
		return OK;
	}
	if((i<ADDR+0 || i>ADDR+7) && i!=PC && i!=ZPC && i!=FAIL) {	/* Can't indirect off non address regs */
		opP->error="Invalid indirect register";
		return FAIL;
	}
	if(*str!='@')
		abort();
	str++;
	switch(*str) {
	case '\0':
		opP->mode=AINDR;
		return OK;
	case '-':
		opP->mode=ADEC;
		return OK;
	case '+':
		opP->mode=AINC;
		return OK;
	case '(':
		str++;
		break;
	default:
		opP->error="Junk after indirect";
		return FAIL;
	}
		/* Some kind of indexing involved.  Lets find out how bad it is */
	i=try_index(&str,opP);
		/* Didn't start with an index reg, maybe its offset or offset,reg */
	if(i==FAIL) {
		char *beg_str;

		beg_str=str;
		for(i=1;i;) {
			switch(*str++) {
			case '\0':
				opP->error="Missing )";
				return FAIL;
			case ',': i=0; break;
			case '(': i++; break;
			case ')': --i; break;
			}
		}
		opP->con1=add_exp(beg_str,str-2);
			/* Should be offset,reg */
		if(str[-1]==',') {
			i=try_index(&str,opP);
			if(i==FAIL) {
				opP->error="Malformed index reg";
				return FAIL;
			}
		}
	}
		/* We've now got offset)   offset,reg)   or    reg) */

	if(*str=='\0') {
		/* Th-the-thats all folks */
		if(opP->reg==FAIL) opP->mode=AINDX;	/* Other form of indirect */
		else if(opP->ireg==FAIL) opP->mode=AOFF;
		else opP->mode=AINDX;
		return OK;
	}
		/* Next thing had better be another @ */
	if(*str!='@' || str[1]!='(') {
		opP->error="junk after indirect";
		return FAIL;
	}
	str+=2;
	if(opP->ireg!=FAIL) {
		opP->mode=APRDX;
		i=try_index(&str,opP);
		if(i!=FAIL) {
			opP->error="Two index registers!  not allowed!";
			return FAIL;
		}
	} else
		i=try_index(&str,opP);
	if(i==FAIL) {
		char *beg_str;

		beg_str=str;
		for(i=1;i;) {
			switch(*str++) {
			case '\0':
				opP->error="Missing )";
				return FAIL;
			case ',': i=0; break;
			case '(': i++; break;
			case ')': --i; break;
			}
		}
		opP->con2=add_exp(beg_str,str-2);
		if(str[-1]==',') {
			if(opP->ireg!=FAIL) {
				opP->error="Can't have two index regs";
				return FAIL;
			}
			i=try_index(&str,opP);
			if(i==FAIL) {
				opP->error="malformed index reg";
				return FAIL;
			}
			opP->mode=APODX;
		} else if(opP->ireg!=FAIL)
			opP->mode=APRDX;
		else
			opP->mode=AMIND;
	} else
		opP->mode=APODX;
	if(*str!='\0') {
		opP->error="Junk after indirect";
		return FAIL;
	}
	return OK;
}

int
try_index(s,opP)
char **s;
struct m68k_op *opP;
{
	register int	i;
	char	*ss;
#define SKIP_W()	{ ss++; if(*ss==' ') ss++;}

	ss= *s;
	/* SKIP_W(); */
	i=m68k_reg_parse(&ss);
	if(!(i>=DATA+0 && i<=ADDR+7)) {	/* if i is not DATA or ADDR reg */
		*s=ss;
		return FAIL;
	}
	opP->ireg=i;
	/* SKIP_W(); */
	if(*ss==')') {
		opP->isiz=0;
		opP->imul=1;
		SKIP_W();
		*s=ss;
		return OK;
	}
	if(*ss!=':') {
		opP->error="Missing : in index register";
		*s=ss;
		return FAIL;
	}
	SKIP_W();
	if(mklower(*ss)=='w') opP->isiz=2;
	else if(mklower(*ss)=='l') opP->isiz=3;
	else {
		opP->error="Size spec not :w or :l";
		*s=ss;
		return FAIL;
	}
	SKIP_W();
	if(*ss==':') {
		SKIP_W();
		switch(*ss) {
		case '1':
		case '2':
		case '4':
		case '8':
			opP->imul= *ss-'0';
			break;
		default:
			opP->error="index multiplier not 1, 2, 4 or 8";
			*s=ss;
			return FAIL;
		}
		SKIP_W();
	} else opP->imul=1;
	if(*ss!=')') {
		opP->error="Missing )";
		*s=ss;
		return FAIL;
	}
	SKIP_W();
	*s=ss;
	return OK;
}

#ifdef TEST1	/* TEST1 tests m68k_ip_op(), which parses operands */
main()
{
	char buf[128];
	struct m68k_op thark;

	for(;;) {
		if(!gets(buf))
			break;
		bzero(&thark,sizeof(thark));
		if(!m68k_ip_op(buf,&thark)) printf("FAIL:");
		if(thark.error)
			printf("op1 error %s in %s\n",thark.error,buf);
		printf("mode %d, reg %d, ",thark.mode,thark.reg);
		if(thark.b_const)
			printf("Constant: '%.*s',",1+thark.e_const-thark.b_const,thark.b_const);
		printf("ireg %d, isiz %d, imul %d ",thark.ireg,thark.isiz,thark.imul);
		if(thark.b_iadd)
			printf("Iadd: '%.*s'",1+thark.e_iadd-thark.b_iadd,thark.b_iadd);
		printf("\n");
	}
	exit(0);
}

#endif


static struct hash_control*   op_hash = NULL;	/* handle of the OPCODE hash table
				   NULL means any use before m68_ip_begin()
				   will crash */


/*
 *                  m 6 8 _ i p ( )
 *
 * This converts a string into a 68k instruction.
 * The string must be a bare single instruction in sun format
 * with RMS-style 68020 indirects
 *  (example:  )
 *
 * It provides some error messages: at most one fatal error message (which
 * stops the scan) and at most one warning message for each operand.
 * The 68k instruction is returned in exploded form, since we have no
 * knowledge of how you parse (or evaluate) your expressions.
 * We do however strip off and decode addressing modes and operation
 * mnemonic.
 *
 * This function's value is a string. If it is not "" then an internal
 * logic error was found: read this code to assign meaning to the string.
 * No argument string should generate such an error string:
 * it means a bug in our code, not in the user's text.
 *
 * You MUST have called m86_ip_begin() once and m86_ip_end() never before using
 * this function.
 */

/* JF this function no longer returns a useful value.  Sorry */
void
m68_ip (instring)
char	*instring;
{
	register char *p;
	register struct m68k_op *opP;
	register struct m68_incant *opcode;
	register char *s;
	register int tmpreg,
		baseo,
		outro,
		nextword;
	int	siz1,
		siz2;
	char	c;
	int	losing;
	int	opsfound;
	char	*crack_operand();
	char	*atof_m68k();
	LITTLENUM_TYPE words[6];
	LITTLENUM_TYPE *wordp;

	if (*instring == ' ')
		instring++;			/* skip leading whitespace */

  /* Scan up to end of operation-code, which MUST end in end-of-string
     or exactly 1 space. */
	for (p = instring; *p != '\0'; p++)
		if (*p == ' ')
			break;


	if (p == instring) {
		the_ins.error = "No operator";
		the_ins.opcode[0] = NULL;
		/* the_ins.numo=1; */
		return;
	}

  /* p now points to the end of the opcode name, probably whitespace.
     make sure the name is null terminated by clobbering the whitespace,
     look it up in the hash table, then fix it back. */   
	c = *p;
	*p = '\0';
	opcode = (struct m68_incant *)hash_find (op_hash, instring);
	*p = c;

	if (opcode == NULL) {
		the_ins.error = "Unknown operator";
		the_ins.opcode[0] = NULL;
		/* the_ins.numo=1; */
		return;
	}

  /* found a legitimate opcode, start matching operands */
	for(opP= &the_ins.operands[0];*p;opP++) {
		p = crack_operand (p, opP);
		if(opP->error) {
			the_ins.error=opP->error;
			return;
		}
	}

	opsfound=opP- &the_ins.operands[0];
	/* This ugly hack is to support the floating pt opcodes in their standard form */
	/* Essentially, we fake a first enty of type COP#1 */
	if(opcode->m_operands[0]=='I') {
		int	n;

		for(n=opsfound;n>0;--n)
			the_ins.operands[n]=the_ins.operands[n-1];

		/* bcopy((char *)(&the_ins.operands[0]),(char *)(&the_ins.operands[1]),opsfound*sizeof(the_ins.operands[0])); */
		bzero((char *)(&the_ins.operands[0]),sizeof(the_ins.operands[0]));
		the_ins.operands[0].mode=MSCR;
		the_ins.operands[0].reg=COPNUM;		/* COP #1 */
		opsfound++;
	}
		/* We've got the operands.  Find an opcode that'll
		   accept them */
	for(losing=0;;) {
		if(opsfound!=opcode->m_opnum)
			losing++;
		else for(s=opcode->m_operands,opP= &the_ins.operands[0];*s && !losing;s+=2,opP++) {
				/* Warning: this switch is huge! */
				/* I've tried to organize the cases into  this order:
				   non-alpha first, then alpha by letter.  lower-case goes directly
				   before uppercase counterpart. */
				/* Code with multiple case ...: gets sorted by the lowest case ...
				   it belongs to.  I hope this makes sense. */
			switch(*s) {
			case '!':
				if(opP->mode==MSCR || opP->mode==IMMED ||
 opP->mode==DREG || opP->mode==AREG || opP->mode==AINC || opP->mode==ADEC || opP->mode==REGLST)
					losing++;
				break;

			case '#':
				if(opP->mode!=IMMED)
 					losing++;
				else {
					long t;

					t=get_num(opP->con1,80);
					if(s[1]=='b' && !isbyte(t))
						losing++;
					else if(s[1]=='w' && !isword(t))
						losing++;
				}
				break;

			case '^':
			case 'T':
				if(opP->mode!=IMMED)
					losing++;
				break;

			case '$':
				if(opP->mode==MSCR || opP->mode==AREG ||
 opP->mode==IMMED || opP->reg==PC || opP->reg==ZPC || opP->mode==REGLST)
					losing++;
				break;

			case '%':
				if(opP->mode==MSCR || opP->reg==PC ||
 opP->reg==ZPC || opP->mode==REGLST)
					losing++;
				break;


			case '&':
				if(opP->mode==MSCR || opP->mode==DREG ||
 opP->mode==AREG || opP->mode==IMMED || opP->reg==PC || opP->reg==ZPC ||
 opP->mode==AINC || opP->mode==ADEC || opP->mode==REGLST)
					losing++;
				break;

			case '*':
				if(opP->mode==MSCR || opP->mode==REGLST)
					losing++;
				break;

			case '+':
				if(opP->mode!=AINC)
					losing++;
				break;

			case '-':
				if(opP->mode!=ADEC)
					losing++;
				break;

			case '/':
				if(opP->mode==MSCR || opP->mode==AREG ||
 opP->mode==AINC || opP->mode==ADEC || opP->mode==IMMED || opP->mode==REGLST)
					losing++;
				break;

			case ';':
				if(opP->mode==MSCR || opP->mode==AREG || opP->mode==REGLST)
					losing++;
				break;

			case '?':
				if(opP->mode==MSCR || opP->mode==AREG ||
 opP->mode==AINC || opP->mode==ADEC || opP->mode==IMMED || opP->reg==PC ||
 opP->reg==ZPC || opP->mode==REGLST)
					losing++;
				break;

			case '@':
				if(opP->mode==MSCR || opP->mode==AREG ||
 opP->mode==IMMED || opP->mode==REGLST)
					losing++;
				break;

			case '~':		/* For now! (JF FOO is this right?) */
				if(opP->mode==MSCR || opP->mode==DREG ||
 opP->mode==AREG || opP->mode==IMMED || opP->reg==PC || opP->reg==ZPC || opP->mode==REGLST)
					losing++;
				break;

			case 'A':
				if(opP->mode!=AREG)
					losing++;
				break;

			case 'B':	/* FOO */
				if(opP->mode!=ABSL)
					losing++;
				break;

			case 'C':
				if(opP->mode!=MSCR || opP->reg!=CCR)
					losing++;
				break;

			case 'd':	/* FOO This mode is a KLUDGE!! */
				if(opP->mode!=AOFF && (opP->mode!=ABSL ||
 opP->con1->e_beg[0]!='(' || opP->con1->e_end[0]!=')'))
					losing++;
				break;

			case 'D':
				if(opP->mode!=DREG)
					losing++;
				break;

			case 'F':
				if(opP->mode!=MSCR || opP->reg<(FPREG+0) || opP->reg>(FPREG+7))
					losing++;
				break;

			case 'I':
				if(opP->mode!=MSCR || opP->reg<COPNUM ||
 opP->reg>=COPNUM+7)
					losing++;
				break;

			case 'J':
				if(opP->mode!=MSCR || opP->reg<USP || opP->reg>MSP)
					losing++;
				break;

			case 'k':
				if(opP->mode!=IMMED)
					losing++;
				break;

			case 'l':
			case 'L':
				if(opP->mode==DREG || opP->mode==AREG || opP->mode==FPREG) {
					if(s[1]=='8')
						losing++;
					else {
						opP->mode=REGLST;
						opP->reg=1<<(opP->reg-DATA);
					}
				} else if(opP->mode!=REGLST) {
					losing++;
				} else if(s[1]=='8' && opP->reg&0x0FFffFF)
					losing++;
				else if(s[1]=='3' && opP->reg&0x7000000)
					losing++;
				break;

			case 'M':
				if(opP->mode!=IMMED)
					losing++;
				else {
					long t;

					t=get_num(opP->con1,80);
					if(!issbyte(t) || isvar(opP->con1))
						losing++;
				}
				break;

			case 'O':
				if(opP->mode!=DREG && opP->mode!=IMMED)
					losing++;
				break;

			case 'Q':
				if(opP->mode!=IMMED)
					losing++;
				else {
					long t;

					t=get_num(opP->con1,80);
					if(t<1 || t>8 || isvar(opP->con1))
						losing++;
				}
				break;

			case 'R':
				if(opP->mode!=DREG && opP->mode!=AREG)
					losing++;
				break;

			case 's':
				if(opP->mode!=MSCR || !(opP->reg==FPI || opP->reg==FPS || opP->reg==FPC))
					losing++;
				break;

			case 'S':
				if(opP->mode!=MSCR || opP->reg!=SR)
					losing++;
				break;

			case 'U':
				if(opP->mode!=MSCR || opP->reg!=USP)
					losing++;
				break;

			/* JF these are out of order.  We could put them
			   in order if we were willing to put up with
			   bunches of #ifdef m68851s in the code */
#ifdef m68851
			/* Memory addressing mode used by pflushr */
			case '|':
				if(opP->mode==MSCR || opP->mode==DREG ||
 opP->mode==AREG || opP->mode==REGLST)
					losing++;
				break;

			case 'f':
				if (opP->mode != MSCR || (opP->reg != SFC && opP->reg != DFC))
					losing++;
				break;

			case 'P':
				if (opP->mode != MSCR || (opP->reg != TC && opP->reg != CAL &&
				    opP->reg != VAL && opP->reg != SCC && opP->reg != AC))
					losing++;
				break;

			case 'V':
				if (opP->reg != VAL)
					losing++;
				break;

			case 'W':
				if (opP->mode != MSCR || (opP->reg != DRP && opP->reg != SRP &&
				    opP->reg != CRP))
					losing++;
				break;

			case 'X':
				if (opP->mode != MSCR ||
				    (!(opP->reg >= BAD && opP->reg <= BAD+7) &&
				     !(opP->reg >= BAC && opP->reg <= BAC+7)))
					losing++;
				break;

			case 'Y':
				if (opP->reg != PSR)
					losing++;
				break;

			case 'Z':
				if (opP->reg != PCSR)
					losing++;
				break;
#endif
			default:
				as_fatal("Internal error:  Operand mode %c unknown",*s);
			}
		}
		if(!losing)
			break;
		opcode=opcode->m_next;
		if(!opcode) {		/* Fell off the end */
			the_ins.error="instruction/operands mismatch";
			return;
		}
		losing=0;
	}
	the_ins.args=opcode->m_operands;
	the_ins.numargs=opcode->m_opnum;
	the_ins.numo=opcode->m_codenum;
	the_ins.opcode[0]=getone(opcode);
	the_ins.opcode[1]=gettwo(opcode);

	for(s=the_ins.args,opP= &the_ins.operands[0];*s;s+=2,opP++) {
			/* This switch is a doozy.
			   What the first step; its a big one! */
		switch(s[0]) {

		case '*':
		case '~':
		case '%':
		case ';':
		case '@':
		case '!':
		case '&':
		case '$':
		case '?':
		case '/':
#ifdef m68851
		case '|':
#endif
			switch(opP->mode) {
			case IMMED:
				tmpreg=0x3c;	/* 7.4 */
				if(index("bwl",s[1])) nextword=get_num(opP->con1,80);
				else nextword=nextword=get_num(opP->con1,0);
				if(isvar(opP->con1))
					add_fix(s[1],opP->con1,0);
				switch(s[1]) {
				case 'b':
					if(!isbyte(nextword))
						opP->error="operand out of range";
					addword(nextword);
					baseo=0;
					break;
				case 'w':
					if(!isword(nextword))
						opP->error="operand out of range";
					addword(nextword);
					baseo=0;
					break;
				case 'l':
					addword(nextword>>16);
					addword(nextword);
					baseo=0;
					break;

				case 'f':
					baseo=2;
					outro=8;
					break;
				case 'F':
					baseo=4;
					outro=11;
					break;
				case 'x':
					baseo=6;
					outro=15;
					break;
				case 'p':
					baseo=6;
					outro= -1;
					break;
				default:
					as_fatal("Internal error:  Can't decode %c%c",*s,s[1]);
				}
				if(!baseo)
					break;

				/* We gotta put out some float */
				if(seg(opP->con1)!=SEG_BIG) {
					int_to_gen(nextword);
					gen_to_words(words,baseo,(long int)outro);
					for(wordp=words;baseo--;wordp++)
						addword(*wordp);
					break;
				}		/* Its BIG */
				if(offs(opP->con1)>0) {
					as_warn("Bignum assumed to be binary bit-pattern");
					if(offs(opP->con1)>baseo) {
						as_warn("Bignum too big for %c format; truncated",s[1]);
						offs(opP->con1)=baseo;
					}
					baseo-=offs(opP->con1);
					for(wordp=generic_bignum+offs(opP->con1)-1;offs(opP->con1)--;--wordp)
						addword(*wordp);
					while(baseo--)
						addword(0);
					break;
				}
				gen_to_words(words,baseo,(long int)outro);
				for(wordp=words;baseo--;wordp++)
					addword(*wordp);
				break;
			case DREG:
				tmpreg=opP->reg-DATA; /* 0.dreg */
				break;
			case AREG:
				tmpreg=0x08+opP->reg-ADDR; /* 1.areg */
				break;
			case AINDR:
				tmpreg=0x10+opP->reg-ADDR; /* 2.areg */
				break;
			case ADEC:
				tmpreg=0x20+opP->reg-ADDR; /* 4.areg */
				break;
			case AINC:
				tmpreg=0x18+opP->reg-ADDR; /* 3.areg */
				break;
			case AOFF:
				if(opP->reg==PC)
					tmpreg=0x3A; /* 7.2 */
				else
					tmpreg=0x28+opP->reg-ADDR; /* 5.areg */
				nextword=get_num(opP->con1,80);
				/* Force into index mode.  Hope this works */
				if(!issword(nextword)) {
					if(opP->reg==PC)
						tmpreg=0x3B;	/* 7.3 */
					else
						tmpreg=0x30+opP->reg-ADDR;	/* 6.areg */
					/* addword(0x0171); */
/* 171 seems to be wrong, and I can't find the 68020 manual, so we'll try 170
   (which is what the Sun asm seems to generate */
					addword(0x0170);
					if(isvar(opP->con1))
						add_fix('l',opP->con1,0);
					addword(nextword>>16);
					/* addword(nextword); */
				} else if(isvar(opP->con1)) {
					if(!flagseen['l']) {
						add_fix('w',opP->con1,0);
					} else {
						tmpreg=0x30+opP->reg-ADDR;
						addword(0x0170);
						add_fix('l',opP->con1,0);
						addword(nextword>>16);
					}
				}
				addword(nextword);
				break;
			case AINDX:
			case APODX:
			case AMIND:
			case APRDX:
				nextword=0;
				baseo=get_num(opP->con1,80);
				outro=get_num(opP->con2,80);
					/* Figure out the 'addressing mode' */
					/* Also turn on the BASE_DISABLE bit, if needed */
				if(opP->reg==PC || opP->reg==ZPC) {
					tmpreg=0x3b; /* 7.3 */
					if(opP->reg==ZPC)
						nextword|=0x80;
				} else if(opP->reg==FAIL) {
					nextword|=0x80;
					tmpreg=0x30;	/* 6.garbage */
				} else tmpreg=0x30+opP->reg-ADDR; /* 6.areg */

				siz1= (opP->con1) ? opP->con1->e_siz : 0;
				siz2= (opP->con2) ? opP->con2->e_siz : 0;

					/* Index register stuff */
				if(opP->ireg>=DATA+0 && opP->ireg<=ADDR+7) {
					nextword|=(opP->ireg-DATA)<<12;

					if(opP->isiz==0 || opP->isiz==3)
						nextword|=0x800;
					switch(opP->imul) {
					case 1: break;
					case 2: nextword|=0x200; break;
					case 4: nextword|=0x400; break;
					case 8: nextword|=0x600; break;
					default: abort();
					}
						/* IF its simple, GET US OUT OF HERE! */
						/* Must be INDEX, with an index register.  Address register
						   cannot be ZERO-PC, and either :b was forced, or we know it'll fit */
					if(opP->mode==AINDX &&
 opP->reg!=FAIL && opP->reg!=ZPC && (siz1==1 || (issbyte(baseo) &&
 !isvar(opP->con1)))) {
						nextword +=baseo&0xff;
						addword(nextword);
						if(isvar(opP->con1))
							add_fix('B',opP->con1,0);
						break;
					}
				} else
					nextword|=0x40;	/* No index reg */
				
					/* It aint simple */
				nextword|=0x100;
					/* If the guy specified a width, we assume that
					   it is wide enough.  Maybe it isn't.  Ifso, we lose
					 */
				switch(siz1) {
				case 0:
					if(isvar(opP->con1) || !issword(baseo)) {
						siz1=3;
						nextword|=0x30;
					} else if(baseo==0)
						nextword|=0x10;
					else {	
						nextword|=0x20;
						siz1=2;
					}
					break;
				case 1:
					as_warn("Byte dispacement won't work.  Defaulting to :w");
				case 2:
					nextword|=0x20;
					break;
				case 3:
					nextword|=0x30;
					break;
				}

					/* Figure out innner displacement stuff */
				if(opP->mode!=AINDX) {
					switch(siz2) {
					case 0:
						if(isvar(opP->con2) || !issword(outro)) {
							siz2=3;
							nextword|=0x3;
						} else if(outro==0)
							nextword|=0x1;
						else {	
							nextword|=0x2;
							siz2=2;
						}
						break;
					case 1:
						as_warn("Byte dispacement won't work.  Defaulting to :w");
					case 2:
						nextword|=0x2;
						break;
					case 3:
						nextword|=0x3;
						break;
					}
					if(opP->mode==APODX) nextword|=0x04;
					else if(opP->mode==AMIND) nextword|=0x40;
				}
				addword(nextword);

				if(isvar(opP->con1))
					add_fix(siz1==3 ? 'l' : 'w',opP->con1,0);
				if(siz1==3)
					addword(baseo>>16);
				if(siz1)
					addword(baseo);

				if(isvar(opP->con2))
					add_fix(siz2==3 ? 'l' : 'w',opP->con2,0);
				if(siz2==3)
					addword(outro>>16);
				if(siz2)
					addword(outro);

				break;

			case ABSL:
				nextword=get_num(opP->con1,80);
				switch(opP->isiz) {
				case 0:
					if(!isvar(opP->con1) && issword(offs(opP->con1))) {
						tmpreg=0x38; /* 7.0 */
						addword(nextword);
						break;
					}
					/* Don't generate pc relative code
					   on 68010 and 68000 */
					if(isvar(opP->con1) &&
					   !subs(opP->con1) &&
					   seg(opP->con1)==SEG_TEXT &&
 					   now_seg==SEG_TEXT &&
					   flagseen['m']==0 &&
					    !index("~%&$?", s[0])) {
						tmpreg=0x3A; /* 7.2 */
						add_frag(adds(opP->con1),
							 offs(opP->con1),
							 TAB(PCREL,SZ_UNDEF));
						break;
					}
				case 3:		/* Fall through into long */
					if(isvar(opP->con1))
						add_fix('l',opP->con1,0);

					tmpreg=0x39;	/* 7.1 mode */
					addword(nextword>>16);
					addword(nextword);
					break;

				case 2:		/* Word */
					if(isvar(opP->con1))
						add_fix('w',opP->con1,0);

					tmpreg=0x38;	/* 7.0 mode */
					addword(nextword);
					break;
				}
				break;
			case MSCR:
			default:
				as_warn("unknown/incorrect operand");
				/* abort(); */
			}
			install_gen_operand(s[1],tmpreg);
			break;

		case '#':
		case '^':
			switch(s[1]) {	/* JF: I hate floating point! */
			case 'j':
				tmpreg=70;
				break;
			case '8':
				tmpreg=20;
				break;
			case 'C':
				tmpreg=50;
				break;
			case '3':
			default:
				tmpreg=80;
				break;
			}
			tmpreg=get_num(opP->con1,tmpreg);
			if(isvar(opP->con1))
				add_fix(s[1],opP->con1,0);
			switch(s[1]) {
			case 'b':	/* Danger:  These do no check for
					   certain types of overflow.
					   user beware! */
				if(!isbyte(tmpreg))
					opP->error="out of range";
				insop(tmpreg);
				if(isvar(opP->con1))
					the_ins.reloc[the_ins.nrel-1].n=(opcode->m_codenum)*2;
				break;
			case 'w':
				if(!isword(tmpreg))
					opP->error="out of range";
				insop(tmpreg);
				if(isvar(opP->con1))
					the_ins.reloc[the_ins.nrel-1].n=(opcode->m_codenum)*2;
				break;
			case 'l':
				insop(tmpreg);		/* Because of the way insop works, we put these two out backwards */
				insop(tmpreg>>16);
				if(isvar(opP->con1))
					the_ins.reloc[the_ins.nrel-1].n=(opcode->m_codenum)*2;
				break;
			case '3':
				tmpreg&=0xFF;
			case '8':
			case 'C':
				install_operand(s[1],tmpreg);
				break;
			default:
				as_fatal("Internal error:  Unknown mode #%c",s[1]);
			}
			break;

		case '+':
		case '-':
		case 'A':
			install_operand(s[1],opP->reg-ADDR);
			break;

		case 'B':
			tmpreg=get_num(opP->con1,80);
			switch(s[1]) {
			case 'g':
				if(opP->con1->e_siz) {	/* Deal with fixed size stuff by hand */
					switch(opP->con1->e_siz) {
					case 1:
						add_fix('b',opP->con1,1);
						break;
					case 2:
						add_fix('w',opP->con1,1);
						addword(0);
						break;
					case 3:
						add_fix('l',opP->con1,1);
						addword(0);
						addword(0);
						break;
					default:
						as_fatal("Bad size for expression %d",opP->con1->e_siz);
					}
				} else if(subs(opP->con1)) {
						/* We can't relax it */
					the_ins.opcode[the_ins.numo-1]|=0xff;
					add_fix('l',opP->con1,1);
					addword(0);
					addword(0);
				} else if(adds(opP->con1)) {
					if (flagseen['m'] && 
					    (the_ins.opcode[0] >= 0x6200) &&
					    (the_ins.opcode[0] <= 0x6f00)) {
					  add_frag(adds(opP->con1),offs(opP->con1),TAB(BCC68000,SZ_UNDEF));
				        } else {
					add_frag(adds(opP->con1),offs(opP->con1),TAB(BRANCH,SZ_UNDEF));
				        }
				} else {
					/* JF:  This is the WRONG thing to do
					add_frag((symbolS *)0,offs(opP->con1),TAB(BRANCH,BYTE)); */
					the_ins.opcode[the_ins.numo-1]|=0xff;
					add_fix('l',opP->con1,1);
					addword(0);
					addword(4);
				}
				break;
			case 'w':
				if(isvar(opP->con1)) {
				    /* check for DBcc instruction */
                                    if ((the_ins.opcode[0] & 0xf0f8) ==0x50c8){
                                            /* size varies if patch */
                                            /* needed for long form */
                                            add_frag(adds(opP->con1),offs(opP->con1),TAB(DBCC,SZ_UNDEF));
                                            break;
                                        }
                                        
						/* Don't ask! */
					opP->con1->e_exp.X_add_number+=2;
					add_fix('w',opP->con1,1);
				}
				addword(0);
				break;
			case 'c':
				if(opP->con1->e_siz) {
					switch(opP->con1->e_siz) {
					case 2:
						add_fix('w',opP->con1,1)
						addword(0);
						break;
					case 3:
						the_ins.opcode[the_ins.numo-1]|=0x40;
						add_fix('l',opP->con1,1);
						addword(0);
						addword(0);
						break;
					default:
						as_warn("Bad size for offset, must be word or long");
						break;
					}
				} else if(subs(opP->con1)) {
					add_fix('l',opP->con1,1);
					add_frag((symbolS *)0,(long)0,TAB(FBRANCH,LONG));
				} else if(adds(opP->con1)) {
					add_frag(adds(opP->con1),offs(opP->con1),TAB(FBRANCH,SZ_UNDEF));
				} else {
					/* add_frag((symbolS *)0,offs(opP->con1),TAB(FBRANCH,SHORT)); */
					the_ins.opcode[the_ins.numo-1]|=0x40;
					add_fix('l',opP->con1,1);
					addword(0);
					addword(4);
				}
				break;
			default:
				as_fatal("Internal error:  operand type B%c unknown",s[1]);
			}
			break;

		case 'C':		/* Ignore it */
			break;

		case 'd':		/* JF this is a kludge */
			if(opP->mode==AOFF) {
				install_operand('s',opP->reg-ADDR);
			} else {
				char *tmpP;

				tmpP=opP->con1->e_end-2;
				opP->con1->e_beg++;
				opP->con1->e_end-=4;	/* point to the , */
				baseo=m68k_reg_parse(&tmpP);
				if(baseo<ADDR+0 || baseo>ADDR+7) {
					as_warn("Unknown address reg, using A0");
					baseo=0;
				} else baseo-=ADDR;
				install_operand('s',baseo);
			}
			tmpreg=get_num(opP->con1,80);
			if(!issword(tmpreg)) {
				as_warn("Expression out of range, using 0");
				tmpreg=0;
			}
			addword(tmpreg);
			break;

		case 'D':
			install_operand(s[1],opP->reg-DATA);
			break;

		case 'F':
			install_operand(s[1],opP->reg-FPREG);
			break;

		case 'I':
			tmpreg=1+opP->reg-COPNUM;
			if(tmpreg==8)
				tmpreg=0;
			install_operand(s[1],tmpreg);
			break;

		case 'J':		/* JF foo */
			switch(opP->reg) {
			case SFC:
				tmpreg=0;
				break;
			case DFC:
				tmpreg=0x001;
				break;
			case CACR:
				tmpreg=0x002;
				break;
			case USP:
				tmpreg=0x800;
				break;
			case VBR:
				tmpreg=0x801;
				break;
			case CAAR:
				tmpreg=0x802;
				break;
			case MSP:
				tmpreg=0x803;
				break;
			case ISP:
				tmpreg=0x804;
				break;
			default:
				abort();
			}
			install_operand(s[1],tmpreg);
			break;

		case 'k':
			tmpreg=get_num(opP->con1,55);
			install_operand(s[1],tmpreg&0x7f);
			break;

		case 'l':
			tmpreg=opP->reg;
			if(s[1]=='w') {
				if(tmpreg&0x7FF0000)
					as_warn("Floating point register in register list");
				insop(reverse_16_bits(tmpreg));
			} else {
				if(tmpreg&0x700FFFF)
					as_warn("Wrong register in floating-point reglist");
				install_operand(s[1],reverse_8_bits(tmpreg>>16));
			}
			break;

		case 'L':
			tmpreg=opP->reg;
			if(s[1]=='w') {
				if(tmpreg&0x7FF0000)
					as_warn("Floating point register in register list");
				insop(tmpreg);
			} else if(s[1]=='8') {
				if(tmpreg&0x0FFFFFF)
					as_warn("incorrect register in reglist");
				install_operand(s[1],tmpreg>>24);
			} else {
				if(tmpreg&0x700FFFF)
					as_warn("wrong register in floating-point reglist");
				else
					install_operand(s[1],tmpreg>>16);
			}
			break;

		case 'M':
			install_operand(s[1],get_num(opP->con1,60));
			break;

		case 'O':
			tmpreg= (opP->mode==DREG)
				? 0x20+opP->reg-DATA
				: (get_num(opP->con1,40)&0x1F);
			install_operand(s[1],tmpreg);
			break;

		case 'Q':
			tmpreg=get_num(opP->con1,10);
			if(tmpreg==8)
				tmpreg=0;
			install_operand(s[1],tmpreg);
			break;

		case 'R':
			/* This depends on the fact that ADDR registers are
			   eight more than their corresponding DATA regs, so
			   the result will have the ADDR_REG bit set */
			install_operand(s[1],opP->reg-DATA);
			break;

		case 's':
			if(opP->reg==FPI) tmpreg=0x1;
			else if(opP->reg==FPS) tmpreg=0x2;
			else if(opP->reg==FPC) tmpreg=0x4;
			else abort();
			install_operand(s[1],tmpreg);
			break;

		case 'S':	/* Ignore it */
			break;

		case 'T':
			install_operand(s[1],get_num(opP->con1,30));
			break;

		case 'U':	/* Ignore it */
			break;

#ifdef m68851
			/* JF: These are out of order, I fear. */
		case 'f':
			switch (opP->reg) {
			case SFC:
				tmpreg=0;
				break;
			case DFC:
				tmpreg=1;
				break;
			default:
				abort();
			}
			install_operand(s[1],tmpreg);
			break;

		case 'P':
			switch(opP->reg) {
			case TC:
				tmpreg=0;
				break;
			case CAL:
				tmpreg=4;
				break;
			case VAL:
				tmpreg=5;
				break;
			case SCC:
				tmpreg=6;
				break;
			case AC:
				tmpreg=7;
				break;
			default:
				abort();
			}
			install_operand(s[1],tmpreg);
			break;

		case 'V':
			if (opP->reg == VAL)
				break;
			abort();

		case 'W':
			switch(opP->reg) {

			case DRP:
				tmpreg=1;
				break;
			case SRP:
				tmpreg=2;
				break;
			case CRP:
				tmpreg=3;
				break;
			default:
				abort();
			}
			install_operand(s[1],tmpreg);
			break;

		case 'X':
			switch (opP->reg) {
			case BAD: case BAD+1: case BAD+2: case BAD+3:
			case BAD+4: case BAD+5: case BAD+6: case BAD+7:
				tmpreg = (4 << 10) | ((opP->reg - BAD) << 2);
				break;

			case BAC: case BAC+1: case BAC+2: case BAC+3:
			case BAC+4: case BAC+5: case BAC+6: case BAC+7:
				tmpreg = (5 << 10) | ((opP->reg - BAC) << 2);
				break;

			default:
				abort();
			}
			install_operand(s[1], tmpreg);
			break;
		case 'Y':
			if (opP->reg == PSR)
				break;
			abort();

		case 'Z':
			if (opP->reg == PCSR)
				break;
			abort;
#endif /* m68851 */
		default:
			as_fatal("Internal error:  Operand type %c unknown",s[0]);
		}
	}
	/* By the time whe get here (FINALLY) the_ins contains the complete
	   instruction, ready to be emitted. . . */
}

int
get_regs(i,str,opP)
struct m68k_op *opP;
char *str;
{
	/*			     26, 25, 24, 23-16,  15-8, 0-7 */
	/* Low order 24 bits encoded fpc,fps,fpi,fp7-fp0,a7-a0,d7-d0 */
	unsigned long int cur_regs = 0;
	int	reg1,
		reg2;

#define ADD_REG(x)	{     if(x==FPI) cur_regs|=(1<<24);\
			 else if(x==FPS) cur_regs|=(1<<25);\
			 else if(x==FPC) cur_regs|=(1<<26);\
			 else cur_regs|=(1<<(x-1));  }

	reg1=i;
	for(;;) {
		if(*str=='/') {
			ADD_REG(reg1);
			str++;
		} else if(*str=='-') {
			str++;
			reg2=m68k_reg_parse(&str);
			if(reg2<DATA || reg2>=FPREG+8 || reg1==FPI || reg1==FPS || reg1==FPC) {
				opP->error="unknown register in register list";
				return FAIL;
			}
			while(reg1<=reg2) {
				ADD_REG(reg1);
				reg1++;
			}
			if(*str=='\0')
				break;
		} else if(*str=='\0') {
			ADD_REG(reg1);
			break;
		} else {
			opP->error="unknow character in register list";
			return FAIL;
		}
/* DJA -- Bug Fix.  Did't handle d1-d2/a1 until the following instruction was added */
		if (*str=='/')
		  str ++;
		reg1=m68k_reg_parse(&str);
		if((reg1<DATA || reg1>=FPREG+8) && !(reg1==FPI || reg1==FPS || reg1==FPC)) {
			opP->error="unknown register in register list";
			return FAIL;
		}
	}
	opP->reg=cur_regs;
	return OK;
}

int
reverse_16_bits(in)
int in;
{
	int out=0;
	int n;

	static int mask[16] = {
0x0001,0x0002,0x0004,0x0008,0x0010,0x0020,0x0040,0x0080,
0x0100,0x0200,0x0400,0x0800,0x1000,0x2000,0x4000,0x8000
	};
	for(n=0;n<16;n++) {
		if(in&mask[n])
			out|=mask[15-n];
	}
	return out;
}

int
reverse_8_bits(in)
int in;
{
	int out=0;
	int n;

	static int mask[8] = {
0x0001,0x0002,0x0004,0x0008,0x0010,0x0020,0x0040,0x0080,
	};

	for(n=0;n<8;n++) {
		if(in&mask[n])
			out|=mask[7-n];
	}
	return out;
}
	
void
install_operand(mode,val)
int mode;
int val;
{
	switch(mode) {
	case 's':
		the_ins.opcode[0]|=val & 0xFF;	/* JF FF is for M kludge */
		break;
	case 'd':
		the_ins.opcode[0]|=val<<9;
		break;
	case '1':
		the_ins.opcode[1]|=val<<12;
		break;
	case '2':
		the_ins.opcode[1]|=val<<6;
		break;
	case '3':
		the_ins.opcode[1]|=val;
		break;
	case '4':
		the_ins.opcode[2]|=val<<12;
		break;
	case '5':
		the_ins.opcode[2]|=val<<6;
		break;
	case '6':
			/* DANGER!  This is a hack to force cas2l and cas2w cmds
			   to be three words long! */
		the_ins.numo++;
		the_ins.opcode[2]|=val;
		break;
	case '7':
		the_ins.opcode[1]|=val<<7;
		break;
	case '8':
		the_ins.opcode[1]|=val<<10;
		break;
#ifdef m68851
	case '9':
		the_ins.opcode[1]|=val<<5;
		break;
#endif
		
	case 't':
		the_ins.opcode[1]|=(val<<10)|(val<<7);
		break;
	case 'D':
		the_ins.opcode[1]|=(val<<12)|val;
		break;
	case 'g':
		the_ins.opcode[0]|=val=0xff;
		break;
	case 'i':
		the_ins.opcode[0]|=val<<9;
		break;
	case 'C':
		the_ins.opcode[1]|=val;
		break;
	case 'j':
		the_ins.opcode[1]|=val;
		the_ins.numo++;		/* What a hack */
		break;
	case 'k':
		the_ins.opcode[1]|=val<<4;
		break;
	case 'b':
	case 'w':
	case 'l':
		break;
	case 'c':
	default:
		abort();
	}
}

void
install_gen_operand(mode,val)
int mode;
int val;
{
	switch(mode) {
	case 's':
		the_ins.opcode[0]|=val;
		break;
	case 'd':
			/* This is a kludge!!! */
		the_ins.opcode[0]|=(val&0x07)<<9|(val&0x38)<<3;
		break;
	case 'b':
	case 'w':
	case 'l':
	case 'f':
	case 'F':
	case 'x':
	case 'p':
		the_ins.opcode[0]|=val;
		break;
		/* more stuff goes here */
	default:
		abort();
	}
}

char *
crack_operand(str,opP)
register char *str;
register struct m68k_op *opP;
{
	register int parens;
	register int c;
	register char *beg_str;

	if(!str) {
		return str;
	}
	beg_str=str;
	for(parens=0;*str && (parens>0 || notend(str));str++) {
		if(*str=='(') parens++;
		else if(*str==')') {
			if(!parens) {		/* ERROR */
				opP->error="Extra )";
				return str;
			}
			--parens;
		}
	}
	if(!*str && parens) {		/* ERROR */
		opP->error="Missing )";
		return str;
	}
	c= *str;
	*str='\0';
	if(m68k_ip_op(beg_str,opP)==FAIL) {
		*str=c;
		return str;
	}
	*str=c;
	if(c=='}')
		c= *++str;		/* JF bitfield hack */
	if(c) {
 		c= *++str;
		if(!c)
			as_warn("Missing operand");
	}
	return str;
}

/* See the comment up above where the #define notend(... is */
#if 0
notend(s)
char *s;
{
	if(*s==',') return 0;
	if(*s=='{' || *s=='}')
		return 0;
	if(*s!=':') return 1;
		/* This kludge here is for the division cmd, which is a kludge */
	if(index("aAdD#",s[1])) return 0;
	return 1;
}
#endif

/* This is the guts of the machine-dependent assembler.  STR points to a
   machine dependent instruction.  This funciton is supposed to emit
   the frags/bytes it assembles to.
 */
void
md_assemble(str)
char *str;
{
	char *er;
	short	*fromP;
	char	*toP;
	int	m,n;
	char	*to_beg_P;
	int	shorts_this_frag;

	bzero((char *)(&the_ins),sizeof(the_ins));	/* JF for paranoia sake */
	m68_ip(str);
	er=the_ins.error;
	if(!er) {
		for(n=the_ins.numargs;n;--n)
			if(the_ins.operands[n].error) {
				er=the_ins.operands[n].error;
				break;
			}
	}
	if(er) {
		as_warn("\"%s\" -- Statement '%s' ignored",er,str);
		return;
	}

	if(the_ins.nfrag==0) {	/* No frag hacking involved; just put it out */
		toP=frag_more(2*the_ins.numo);
		fromP= &the_ins.opcode[0];
		for(m=the_ins.numo;m;--m) {
			md_number_to_chars(toP,(long)(*fromP),2);
			toP+=2;
			fromP++;
		}
			/* put out symbol-dependent info */
		for(m=0;m<the_ins.nrel;m++) {
			switch(the_ins.reloc[m].wid) {
			case 'B':
				n=1;
				break;
			case 'b':
				n=1;
				break;
			case 'w':
				n=2;
				break;
			case 'l':
				n=4;
				break;
			default:
				as_fatal("confusing width %c",the_ins.reloc[m].wid);
			}

			fix_new(frag_now,
			    (toP-frag_now->fr_literal)-the_ins.numo*2+the_ins.reloc[m].n,
			    n,
			    the_ins.reloc[m].add,
			    the_ins.reloc[m].sub,
			    the_ins.reloc[m].off,
			    the_ins.reloc[m].pcrel);
		}
		return;
	}

		/* There's some frag hacking */
	for(n=0,fromP= &the_ins.opcode[0];n<the_ins.nfrag;n++) {
		int wid;

		if(n==0) wid=2*the_ins.fragb[n].fragoff;
		else wid=2*(the_ins.numo-the_ins.fragb[n-1].fragoff);
		toP=frag_more(wid);
		to_beg_P=toP;
		shorts_this_frag=0;
		for(m=wid/2;m;--m) {
			md_number_to_chars(toP,(long)(*fromP),2);
			toP+=2;
			fromP++;
			shorts_this_frag++;
		}
		for(m=0;m<the_ins.nrel;m++) {
			if((the_ins.reloc[m].n)>= 2*shorts_this_frag /* 2*the_ins.fragb[n].fragoff */) {
				the_ins.reloc[m].n-= 2*shorts_this_frag /* 2*the_ins.fragb[n].fragoff */;
				break;
			}
			wid=the_ins.reloc[m].wid;
			if(wid==0)
				continue;
			the_ins.reloc[m].wid=0;
			wid = (wid=='b') ? 1 : (wid=='w') ? 2 : (wid=='l') ? 4 : 4000;

			fix_new(frag_now,
			    (toP-frag_now->fr_literal)-the_ins.numo*2+the_ins.reloc[m].n,
			    wid,
			    the_ins.reloc[m].add,
			    the_ins.reloc[m].sub,
			    the_ins.reloc[m].off,
			    the_ins.reloc[m].pcrel);
		}
		know(the_ins.fragb[n].fadd);
                (void)frag_var(rs_machine_dependent,10,0,(relax_substateT)(the_ins.fragb[n].fragty),
 the_ins.fragb[n].fadd,the_ins.fragb[n].foff,to_beg_P);
	}
	n=(the_ins.numo-the_ins.fragb[n-1].fragoff);
	shorts_this_frag=0;
	if(n) {
		toP=frag_more(n*sizeof(short));
		while(n--) {
			md_number_to_chars(toP,(long)(*fromP),2);
			toP+=2;
			fromP++;
			shorts_this_frag++;
		}
	}
	for(m=0;m<the_ins.nrel;m++) {
		int wid;

		wid=the_ins.reloc[m].wid;
		if(wid==0)
			continue;
		the_ins.reloc[m].wid=0;
		wid = (wid=='b') ? 1 : (wid=='w') ? 2 : (wid=='l') ? 4 : 4000;

		fix_new(frag_now,
		    (the_ins.reloc[m].n + toP-frag_now->fr_literal)-/* the_ins.numo */ shorts_this_frag*2,
		    wid,
		    the_ins.reloc[m].add,
		    the_ins.reloc[m].sub,
		    the_ins.reloc[m].off,
		    the_ins.reloc[m].pcrel);
	}
}

/* This function is called once, at assembler startup time.  This should
   set up all the tables, etc that the MD part of the assembler needs
 */
void
md_begin()
{
/*
 * md_begin -- set up hash tables with 68000 instructions.
 * similar to what the vax assembler does.  ---phr
 */
	/* RMS claims the thing to do is take the m68k-opcode.h table, and make
	   a copy of it at runtime, adding in the information we want but isn't
	   there.  I think it'd be better to have an awk script hack the table
	   at compile time.  Or even just xstr the table and use it as-is.  But
	   my lord ghod hath spoken, so we do it this way.  Excuse the ugly var
	   names.  */

	register struct m68k_opcode *ins;
	register struct m68_incant *hack,
		*slak;
	register char *retval = 0;		/* empty string, or error msg text */
	register int i;
	register char c;

	if ((op_hash = hash_new()) == NULL)
		as_fatal("Virtual memory exhausted");

	obstack_begin(&robyn,4000);
	for (ins = m68k_opcodes; ins < endop; ins++) {
		hack=slak=(struct m68_incant *)obstack_alloc(&robyn,sizeof(struct m68_incant));
		do {
			slak->m_operands=ins->args;
			slak->m_opnum=strlen(slak->m_operands)/2;
			slak->m_opcode=ins->opcode;
				/* This is kludgey */
			slak->m_codenum=((ins->match)&0xffffL) ? 2 : 1;
			if((ins+1)!=endop && !strcmp(ins->name,(ins+1)->name)) {
				slak->m_next=(struct m68_incant *)
obstack_alloc(&robyn,sizeof(struct m68_incant));
				ins++;
			} else
				slak->m_next=0;
			slak=slak->m_next;
		} while(slak);
		
		retval = hash_insert (op_hash, ins->name,(char *)hack);
			/* Didn't his mommy tell him about null pointers? */
		if(retval && *retval)
			as_fatal("Internal Error:  Can't hash %s: %s",ins->name,retval);
	}

	for (i = 0; i < sizeof(mklower_table) ; i++)
		mklower_table[i] = (isupper(c = (char) i)) ? tolower(c) : c;

	for (i = 0 ; i < sizeof(notend_table) ; i++) {
		notend_table[i] = 0;
		alt_notend_table[i] = 0;
	}
	notend_table[','] = 1;
	notend_table['{'] = 1;
	notend_table['}'] = 1;
	alt_notend_table['a'] = 1;
	alt_notend_table['A'] = 1;
	alt_notend_table['d'] = 1;
	alt_notend_table['D'] = 1;
	alt_notend_table['#'] = 1;
}

#if 0
#define notend(s) ((*s == ',' || *s == '}' || *s == '{' \
                   || (*s == ':' && index("aAdD#", s[1]))) \
               ? 0 : 1)
#endif

/* This funciton is called once, before the assembler exits.  It is
   supposed to do any final cleanup for this part of the assembler.
 */
void
md_end()
{
}

#define MAX_LITTLENUMS 6

/* Turn a string in input_line_pointer into a floating point constant of type
   type, and store the appropriate bytes in *litP.  The number of LITTLENUMS
   emitted is stored in *sizeP .  An error message is returned, or NULL on OK.
 */
char *
md_atof(type,litP,sizeP)
char type;
char *litP;
int *sizeP;
{
	int	prec;
	LITTLENUM_TYPE words[MAX_LITTLENUMS];
	LITTLENUM_TYPE *wordP;
	char	*t;
	char	*atof_m68k();

	switch(type) {
	case 'f':
	case 'F':
	case 's':
	case 'S':
		prec = 2;
		break;

	case 'd':
	case 'D':
	case 'r':
	case 'R':
		prec = 4;
		break;

	case 'x':
	case 'X':
		prec = 6;
		break;

	case 'p':
	case 'P':
		prec = 6;
		break;

	default:
		*sizeP=0;
		return "Bad call to MD_ATOF()";
	}
	t=atof_m68k(input_line_pointer,type,words);
	if(t)
		input_line_pointer=t;

	*sizeP=prec * sizeof(LITTLENUM_TYPE);
	for(wordP=words;prec--;) {
		md_number_to_chars(litP,(long)(*wordP++),sizeof(LITTLENUM_TYPE));
		litP+=sizeof(LITTLENUM_TYPE);
	}
	return "";	/* Someone should teach Dean about null pointers */
}

/* Turn an integer of n bytes (in val) into a stream of bytes appropriate
   for use in the a.out file, and stores them in the array pointed to by buf.
   This knows about the endian-ness of the target machine and does
   THE RIGHT THING, whatever it is.  Possible values for n are 1 (byte)
   2 (short) and 4 (long)  Floating numbers are put out as a series of
   LITTLENUMS (shorts, here at least)
 */
void
md_number_to_chars(buf,val,n)
char	*buf;
long	val;
int n;
{
	switch(n) {
	case 1:
		*buf++=val;
		break;
	case 2:
		*buf++=(val>>8);
		*buf++=val;
		break;
	case 4:
		*buf++=(val>>24);
		*buf++=(val>>16);
		*buf++=(val>>8);
		*buf++=val;
		break;
	default:
		abort();
	}
}

void
md_number_to_imm(buf,val,n)
char *buf;
long val;
int n;
{
	switch(n) {
	case 1:
		*buf++=val;
		break;
	case 2:
		*buf++=(val>>8);
		*buf++=val;
		break;
	case 4:
		*buf++=(val>>24);
		*buf++=(val>>16);
		*buf++=(val>>8);
		*buf++=val;
		break;
	default:
		abort();
	}
}

void
md_number_to_disp(buf,val,n)
char	*buf;
long	val;
int n;
{
	abort();
}

void
md_number_to_field(buf,val,fix)
char *buf;
long val;
void *fix;
{
	abort();
}


/* *fragP has been relaxed to its final size, and now needs to have
   the bytes inside it modified to conform to the new size  There is UGLY
   MAGIC here. ..
 */
void
md_convert_frag(fragP)
register fragS *fragP;
{
  long disp;
  long ext;

  /* Address in gas core of the place to store the displacement.  */
  register char *buffer_address = fragP -> fr_fix + fragP -> fr_literal;
  /* Address in object code of the displacement.  */
  register int object_address = fragP -> fr_fix + fragP -> fr_address;

  know(fragP->fr_symbol);

  /* The displacement of the address, from current location.  */
  disp = (fragP->fr_symbol->sy_value + fragP->fr_offset) - object_address;

  switch(fragP->fr_subtype) {
  case TAB(BCC68000,BYTE):
  case TAB(BRANCH,BYTE):
    know(issbyte(disp));
    if(disp==0)
      as_warn("short branch with zero offset: use :w");
    fragP->fr_opcode[1]=disp;
    ext=0;
    break;
  case TAB(DBCC,SHORT):
    know(issword(disp));
    ext=2;
    break;
  case TAB(BCC68000,SHORT):
  case TAB(BRANCH,SHORT):
    know(issword(disp));
    fragP->fr_opcode[1]=0x00;
    ext=2;
    break;
  case TAB(BRANCH,LONG):
    if(flagseen['m']) {
      if(fragP->fr_opcode[0]==0x61) {
	fragP->fr_opcode[0]= 0x4E;
	fragP->fr_opcode[1]= 0xB9;	/* JBSR with ABSL LONG offset */
	subseg_change(SEG_TEXT, 0);
	fix_new(fragP, fragP->fr_fix, 4, fragP->fr_symbol, 0, fragP->fr_offset, 0);
	fragP->fr_fix+=4;
	ext=0;
      } else if(fragP->fr_opcode[0]==0x60) {
        fragP->fr_opcode[0]= 0x4E;
        fragP->fr_opcode[1]= 0xF9;      /* JMP  with ABSL LONG offset */
        subseg_change(SEG_TEXT, 0);
        fix_new(fragP, fragP->fr_fix, 4, fragP->fr_symbol, 0, fragP->fr_offset,0);
        fragP->fr_fix+=4;
        ext=0;
      }else {
        as_warn("Long branch offset not supported.");
      }
    } else {
      fragP->fr_opcode[1]=0xff;
      ext=4;
    }
    break;
  case TAB(BCC68000,LONG):
    {
	/* only Bcc 68000 instructions can come here */
        /* change bcc into b!cc/jmp absl long */
	fragP->fr_opcode[0] ^= 0x01; /* invert bcc */
        fragP->fr_opcode[1] = 0x6;   /* branch offset = 6 */
        fragP->fr_opcode[2] = 0x4e;  /* put in jmp long (0x4ef9) */ 
        fragP->fr_opcode[3] = 0xf9;  
        fragP->fr_fix += 2;	     /* account for jmp instruction */
        subseg_change(SEG_TEXT,0);
        fix_new(fragP, fragP->fr_fix, 4, fragP->fr_symbol, 0, 
					 fragP->fr_offset,0);
        fragP->fr_fix += 4;
        ext=0;
    }
    break;
  case TAB(DBCC,LONG):
    {
        /* only DBcc 68000 instructions can come here */
        /* change dbcc into dbcc/jmp absl long */
        fragP->fr_opcode[2] = 0x00;  /* branch offset = 4 */
        fragP->fr_opcode[3] = 0x04;  
        fragP->fr_opcode[4] = 0x60;  /* put in bra pc+6 */ 
        fragP->fr_opcode[5] = 0x06;  
        fragP->fr_opcode[6] = 0x4e;  /* put in jmp long (0x4ef9) */ 
        fragP->fr_opcode[7] = 0xf9;  

        fragP->fr_fix += 6;	     /* account for bra/jmp instructions */
        subseg_change(SEG_TEXT,0);
        fix_new(fragP, fragP->fr_fix, 4, fragP->fr_symbol, 0, 
					 fragP->fr_offset,0);
        fragP->fr_fix += 4;
        ext=0;
    }
    break;
  case TAB(FBRANCH,SHORT):
    know((fragP->fr_opcode[1]&0x40)==0);
    ext=2;
    break;
  case TAB(FBRANCH,LONG):
    fragP->fr_opcode[1]|=0x40;	/* Turn on LONG bit */
    ext=4;
    break;
  case TAB(PCREL,SHORT):
    ext=2;
    break;
  case TAB(PCREL,LONG):
    /* The thing to do here is force it to ABSOLUTE LONG, since
       PCREL is really trying to shorten an ABSOLUTE address anyway */
    /* JF FOO This code has not been tested */
    subseg_change(SEG_TEXT,0);
    fix_new(fragP, fragP->fr_fix, 4, fragP->fr_symbol, 0, fragP->fr_offset, 0);
    if((fragP->fr_opcode[1] & 0x3F) != 0x3A)
    	as_warn("Internal error (long PC-relative operand) for insn 0x%04lx at 0x%lx",
	        fragP->fr_opcode[0],fragP->fr_address);
    fragP->fr_opcode[1]&= ~0x3F;
    fragP->fr_opcode[1]|=0x39;	/* Mode 7.1 */
    fragP->fr_fix+=4;
    /* md_number_to_chars(buffer_address,
		       (long)(fragP->fr_symbol->sy_value + fragP->fr_offset),
		       4); */
    ext=0;
  }
  if(ext) {
    md_number_to_chars(buffer_address,(long)disp,(int)ext);
    fragP->fr_fix+=ext;
  }
}

/* Force truly undefined symbols to their maximum size, and generally set up
   the frag list to be relaxed
 */
int
md_estimate_size_before_relax(fragP,segtype)
register fragS *fragP;
int segtype;
{
	int	old_fix;

	old_fix=fragP->fr_fix;

        /* handle SZ_UNDEF first, it can be changed to BYTE or SHORT */
	switch(fragP->fr_subtype) {
        case TAB(DBCC,SZ_UNDEF):
                if((fragP->fr_symbol->sy_type&N_TYPE)==segtype) {
                        fragP->fr_subtype=TAB(DBCC,SHORT);
                        fragP->fr_var+=2;
                        break;
                }
        	/* only DBcc 68000 instructions can come here */
                /* change dbcc into dbcc/jmp absl long */
                fragP->fr_opcode[2] = 0x00;  /* branch offset = 4 */
                fragP->fr_opcode[3] = 0x04;  
                fragP->fr_opcode[4] = 0x60;  /* put in bra pc+6 */ 
                fragP->fr_opcode[5] = 0x06;  
                fragP->fr_opcode[6] = 0x4e;  /* put in jmp long (0x4ef9) */ 
                fragP->fr_opcode[7] = 0xf9;  
                fragP->fr_fix += 6;	  /* account for bra/jmp instruction */
                subseg_change(SEG_TEXT,0);
                fix_new(fragP, fragP->fr_fix, 4, fragP->fr_symbol, 0, 
        					 fragP->fr_offset,0);
                fragP->fr_fix += 4;
                frag_wane(fragP);
                break;
                
        case TAB(BCC68000,SZ_UNDEF):
                if((fragP->fr_symbol->sy_type&N_TYPE)==segtype) {
                        fragP->fr_subtype=TAB(BCC68000,BYTE);
                        break;
                }
        	/* only Bcc 68000 instructions can come here */
                /* change bcc into b!cc/jmp absl long */
        	fragP->fr_opcode[0] ^= 0x01; /* invert bcc */
                fragP->fr_opcode[1] = 0x6;   /* branch offset = 6 */
                fragP->fr_opcode[2] = 0x4e;  /* put in jmp long (0x4ef9) */ 
                fragP->fr_opcode[3] = 0xf9;  
                fragP->fr_fix += 2;	     /* account for jmp instruction */
                subseg_change(SEG_TEXT,0);
                fix_new(fragP, fragP->fr_fix, 4, fragP->fr_symbol, 0, 
        					 fragP->fr_offset,0);
                fragP->fr_fix += 4;
                frag_wane(fragP);
                break;
                
	case TAB(BRANCH,SZ_UNDEF):
		if((fragP->fr_symbol->sy_type&N_TYPE)==segtype) {
                        fragP->fr_subtype=TAB(TABTYPE(fragP->fr_subtype),BYTE);
                        break;
		} else if(flagseen['m']) {
		  if(fragP->fr_opcode[0]==0x61) {
		    fragP->fr_opcode[0]= 0x4E;
		    fragP->fr_opcode[1]= 0xB9;	/* JBSR with ABSL LONG offset */
		    subseg_change(SEG_TEXT, 0);
                    fix_new(fragP, fragP->fr_fix, 4, 
			    fragP->fr_symbol, 0, fragP->fr_offset, 0);
		    fragP->fr_fix+=4;
		    frag_wane(fragP);
                  } else if(fragP->fr_opcode[0]==0x60) {
                    fragP->fr_opcode[0]= 0x4E;
                    fragP->fr_opcode[1]= 0xF9;  /* JMP  with ABSL LONG offset */
                    subseg_change(SEG_TEXT, 0);
                    fix_new(fragP, fragP->fr_fix, 4, 
			    fragP->fr_symbol, 0, fragP->fr_offset, 0);
                    fragP->fr_fix+=4;
                    frag_wane(fragP);
		  } else {
                    as_warn("Long branch offset to extern symbol not supported.");
		  }
		} else {	/* Symbol is still undefined.  Make it simple */
			fix_new(fragP,(int)(fragP->fr_fix),4,fragP->fr_symbol,
 (symbolS *)0,fragP->fr_offset+4,1);
			fragP->fr_fix+=4;
			fragP->fr_opcode[1]=0xff;
			frag_wane(fragP);
			break;
		}
	default:
                break;
        }

        /* now that SZ_UNDEF are taken care of, check others */
        switch(fragP->fr_subtype) {
        case TAB(BCC68000,BYTE):
	case TAB(BRANCH,BYTE):
			/* We can't do a short jump to the next instruction,
			   so we force word mode.  */
		if(fragP->fr_symbol && fragP->fr_symbol->sy_value==0 &&
 fragP->fr_symbol->sy_frag==fragP->fr_next) {
                        fragP->fr_subtype=TAB(TABTYPE(fragP->fr_subtype),SHORT);
			fragP->fr_var+=2;
		}
		break;
	case TAB(FBRANCH,SZ_UNDEF):
		if((fragP->fr_symbol->sy_type&N_TYPE)==segtype) {
			fragP->fr_subtype=TAB(FBRANCH,SHORT);
			fragP->fr_var+=2;
		} else {
			fragP->fr_subtype=TAB(FBRANCH,LONG);
			fragP->fr_var+=4;
		}
		break;
	case TAB(PCREL,SZ_UNDEF):
		if((fragP->fr_symbol->sy_type&N_TYPE)==segtype) {
			fragP->fr_subtype=TAB(PCREL,SHORT);
			fragP->fr_var+=2;
		} else {
			fragP->fr_subtype=TAB(PCREL,LONG);
			fragP->fr_var+=4;
		}
		break;
	default:
		break;
	}
	return fragP->fr_var + fragP->fr_fix - old_fix;
}

/* the bit-field entries in the relocation_info struct plays hell 
   with the byte-order problems of cross-assembly.  So as a hack,
   I added this mach. dependent ri twiddler.  Ugly, but it gets
   you there. -KWK */
/* on m68k: first 4 bytes are normal unsigned long, next three bytes
are symbolnum, most sig. byte first.  Last byte is broken up with
bit 7 as pcrel, bits 6 & 5 as length, bit 4 as pcrel, and the lower
nibble as nuthin. (on Sun 3 at least) */
void
md_ri_to_chars(ri_p, ri)
     struct relocation_info *ri_p, ri;
{
  unsigned char the_bytes[8];
  
  /* this is easy */
  md_number_to_chars(the_bytes, ri.r_address, sizeof(ri.r_address));
  /* now the fun stuff */
  the_bytes[4] = (ri.r_symbolnum >> 16) & 0x0ff;
  the_bytes[5] = (ri.r_symbolnum >> 8) & 0x0ff;
  the_bytes[6] = ri.r_symbolnum & 0x0ff;
  the_bytes[7] = (((ri.r_pcrel << 7)  & 0x80) | ((ri.r_length << 5) & 0x60) | 
    ((ri.r_extern << 4)  & 0x10)); 
  /* now put it back where you found it */
  bcopy (the_bytes, (char *)ri_p, sizeof(struct relocation_info));
}

#ifndef WORKING_DOT_WORD
int md_short_jump_size = 4;
int md_long_jump_size = 6;

void
md_create_short_jump(ptr,from_addr,to_addr,frag,to_symbol)
char	*ptr;
long	from_addr,
	to_addr;
fragS	*frag;
symbolS	*to_symbol;
{
	long offset;

	offset = to_addr - (from_addr+2);

	md_number_to_chars(ptr  ,(long)0x6000,2);
	md_number_to_chars(ptr+2,(long)offset,2);
}

void
md_create_long_jump(ptr,from_addr,to_addr,frag,to_symbol)
char	*ptr;
long	from_addr,
	to_addr;
fragS	*frag;
symbolS	*to_symbol;
{
	long offset;

	if(flagseen['m']) {
		offset=to_addr-to_symbol->sy_value;
		md_number_to_chars(ptr  ,(long)0x4EF9,2);
		md_number_to_chars(ptr+2,(long)offset,4);
		fix_new(frag,(ptr+2)-frag->fr_literal,4,to_symbol,(symbolS *)0,(long int)0,0);
	} else {
		offset=to_addr - (from_addr+2);
		md_number_to_chars(ptr  ,(long)0x60ff,2);
		md_number_to_chars(ptr+2,(long)offset,4);
	}
}

#endif
/* Different values of OK tell what its OK to return.  Things that aren't OK are an error (what a shock, no?)

	0:  Everything is OK
	10:  Absolute 1:8	only
	20:  Absolute 0:7	only
	30:  absolute 0:15	only
	40:  Absolute 0:31	only
	50:  absolute 0:127	only
	55:  absolute -64:63    only
	60:  absolute -128:127	only
	70:  absolute 0:4095	only
	80:  No bignums

*/
int
get_num(exp,ok)
struct m68k_exp *exp;
int ok;
{
#ifdef TEST2
	long	l = 0;

	if(!exp->e_beg)
		return 0;
	if(*exp->e_beg=='0') {
		if(exp->e_beg[1]=='x')
			sscanf(exp->e_beg+2,"%x",&l);
		else
			sscanf(exp->e_beg+1,"%O",&l);
		return l;
	}
	return atol(exp->e_beg);
#else
	char	*save_in;
	char	c_save;

	if(!exp) {
		/* Can't do anything */
		return 0;
	}
	if(!exp->e_beg || !exp->e_end) {
		seg(exp)=SEG_ABSOLUTE;
		adds(exp)=0;
		subs(exp)=0;
		offs(exp)= (ok==10) ? 1 : 0;
		as_warn("Null expression defaults to %ld",offs(exp));
		return 0;
	}

	exp->e_siz=0;
	if(/* ok!=80 && */exp->e_end[-1]==':' && (exp->e_end-exp->e_beg)>2) {
		switch(exp->e_end[0]) {
		case 's':
		case 'b':
			exp->e_siz=1;
			break;
		case 'w':
			exp->e_siz=2;
			break;
		case 'l':
			exp->e_siz=3;
			break;
		default:
			as_warn("Unknown size for expression \"%c\"",exp->e_end[0]);
		}
		exp->e_end-=2;
	}
	c_save=exp->e_end[1];
	exp->e_end[1]='\0';
	save_in=input_line_pointer;
	input_line_pointer=exp->e_beg;
	switch(expression(&(exp->e_exp))) {
	case SEG_NONE:
		/* Do the same thing the VAX asm does */
		seg(exp)=SEG_ABSOLUTE;
		adds(exp)=0;
		subs(exp)=0;
		offs(exp)=0;
		if(ok==10) {
			as_warn("expression out of range: defaulting to 1");
			offs(exp)=1;
		}
		break;
	case SEG_ABSOLUTE:
		switch(ok) {
		case 10:
			if(offs(exp)<1 || offs(exp)>8) {
				as_warn("expression out of range: defaulting to 1");
				offs(exp)=1;
			}
			break;
		case 20:
			if(offs(exp)<0 || offs(exp)>7)
				goto outrange;
			break;
		case 30:
			if(offs(exp)<0 || offs(exp)>15)
				goto outrange;
			break;
		case 40:
			if(offs(exp)<0 || offs(exp)>32)
				goto outrange;
			break;
		case 50:
			if(offs(exp)<0 || offs(exp)>127)
				goto outrange;
			break;
		case 55:
			if(offs(exp)<-64 || offs(exp)>63)
				goto outrange;
			break;
		case 60:
			if(offs(exp)<-128 || offs(exp)>127)
				goto outrange;
			break;
		case 70:
			if(offs(exp)<0 || offs(exp)>4095) {
			outrange:
				as_warn("expression out of range: defaulting to 0");
				offs(exp)=0;
			}
			break;
		default:
			break;
		}
		break;
	case SEG_TEXT:
	case SEG_DATA:
	case SEG_BSS:
	case SEG_UNKNOWN:
	case SEG_DIFFERENCE:
		if(ok>=10 && ok<=70) {
			seg(exp)=SEG_ABSOLUTE;
			adds(exp)=0;
			subs(exp)=0;
			offs(exp)= (ok==10) ? 1 : 0;
			as_warn("Can't deal with expression \"%s\": defaulting to %ld",exp->e_beg,offs(exp));
		}
		break;
	case SEG_BIG:
		if(ok==80 && offs(exp)<0) {	/* HACK! Turn it into a long */
			LITTLENUM_TYPE words[6];

			gen_to_words(words,2,8L);/* These numbers are magic! */
			seg(exp)=SEG_ABSOLUTE;
			adds(exp)=0;
			subs(exp)=0;
			offs(exp)=words[1]|(words[0]<<16);
		} else if(ok!=0) {
			seg(exp)=SEG_ABSOLUTE;
			adds(exp)=0;
			subs(exp)=0;
			offs(exp)= (ok==10) ? 1 : 0;
			as_warn("Can't deal with expression \"%s\": defaulting to %ld",exp->e_beg,offs(exp));
		}
		break;
	default:
		abort();
	}
	if(input_line_pointer!=exp->e_end+1)
		as_warn("Ignoring junk after expression");
	exp->e_end[1]=c_save;
	input_line_pointer=save_in;
	if(exp->e_siz) {
		switch(exp->e_siz) {
		case 1:
			if(!isbyte(offs(exp)))
				as_warn("expression doesn't fit in BYTE");
			break;
		case 2:
			if(!isword(offs(exp)))
				as_warn("expression doesn't fit in WORD");
			break;
		}
	}
	return offs(exp);
#endif
}

/* These are the back-ends for the various machine dependent pseudo-ops.  */
void demand_empty_rest_of_line();	/* Hate those extra verbose names */

void
s_data1()
{
	subseg_new(SEG_DATA,1);
	demand_empty_rest_of_line();
}

void
s_data2()
{
	subseg_new(SEG_DATA,2);
	demand_empty_rest_of_line();
}

void
s_even()
{
	register int temp;
	register long int temp_fill;

	temp = 1;		/* JF should be 2? */
	temp_fill = get_absolute_expression ();
	if ( ! need_pass_2 ) /* Never make frag if expect extra pass. */
		frag_align (temp, (int)temp_fill);
	demand_empty_rest_of_line();
}

/* s_space is defined in read.c .skip is simply an alias to it. */

int
md_parse_option(argP,cntP,vecP)
char **argP;
int *cntP;
char ***vecP;
{
	switch(**argP) {
	case 'l':	/* -l means keep external to 2 bit offset
			   rather than 16 bit one */
		break;

	case 'm':
		/* Gas simply ignores this option! */
		(*argP)++;
		if(**argP=='c')
			(*argP)++;
		if(!strcmp(*argP,"68000"))
			flagseen['m']=2;
		else if(!strcmp(*argP,"68010")) {
#ifdef M_SUN
			omagic= 1<<16|OMAGIC;
#endif
			flagseen['m']=1;
		} else if(!strcmp(*argP,"68020"))
			flagseen['m']=0;
		else
			as_warn("Unknown -m option ignored");
		while(**argP)
			(*argP)++;
		break;

	default:
		return 0;
	}
	return 1;
}


#ifdef TEST2

/* TEST2:  Test md_assemble() */
/* Warning, this routine probably doesn't work anymore */

main()
{
	struct m68_it the_ins;
	char buf[120];
	char *cp;
	int	n;

	m68_ip_begin();
	for(;;) {
		if(!gets(buf) || !*buf)
			break;
		if(buf[0]=='|' || buf[1]=='.')
			continue;
		for(cp=buf;*cp;cp++)
			if(*cp=='\t')
				*cp=' ';
		if(is_label(buf))
			continue;
		bzero(&the_ins,sizeof(the_ins));
		m68_ip(&the_ins,buf);
		if(the_ins.error) {
			printf("Error %s in %s\n",the_ins.error,buf);
		} else {
			printf("Opcode(%d.%s): ",the_ins.numo,the_ins.args);
			for(n=0;n<the_ins.numo;n++)
				printf(" 0x%x",the_ins.opcode[n]&0xffff);
			printf("    ");
			print_the_insn(&the_ins.opcode[0],stdout);
			(void)putchar('\n');
		}
		for(n=0;n<strlen(the_ins.args)/2;n++) {
			if(the_ins.operands[n].error) {
				printf("op%d Error %s in %s\n",n,the_ins.operands[n].error,buf);
				continue;
			}
			printf("mode %d, reg %d, ",the_ins.operands[n].mode,the_ins.operands[n].reg);
			if(the_ins.operands[n].b_const)
				printf("Constant: '%.*s', ",1+the_ins.operands[n].e_const-the_ins.operands[n].b_const,the_ins.operands[n].b_const);
			printf("ireg %d, isiz %d, imul %d, ",the_ins.operands[n].ireg,the_ins.operands[n].isiz,the_ins.operands[n].imul);
			if(the_ins.operands[n].b_iadd)
				printf("Iadd: '%.*s',",1+the_ins.operands[n].e_iadd-the_ins.operands[n].b_iadd,the_ins.operands[n].b_iadd);
			(void)putchar('\n');
		}
	}
	m68_ip_end();
	return 0;
}

is_label(str)
char *str;
{
	while(*str==' ')
		str++;
	while(*str && *str!=' ')
		str++;
	if(str[-1]==':' || str[1]=='=')
		return 1;
	return 0;
}

print_address(add,fp)
FILE *fp;
{
	fprintf(fp,"%#X",add);
}

#endif

/* Possible states for relaxation:

0 0	branch offset	byte	(bra, etc)
0 1			word
0 2			long

1 0	indexed offsets	byte	a0@(32,d4:w:1) etc
1 1			word
1 2			long

2 0	two-offset index word-word a0@(32,d4)@(45) etc
2 1			word-long
2 2			long-word
2 3			long-long

*/



#ifdef DONTDEF
abort()
{
	printf("ABORT!\n");
	exit(12);
}

char *index(s,c)
char *s;
{
	while(*s!=c) {
		if(!*s) return 0;
		s++;
	}
	return s;
}

bzero(s,n)
char *s;
{
	while(n--)
		*s++=0;
}

print_frags()
{
	fragS *fragP;
	extern fragS *text_frag_root;

	for(fragP=text_frag_root;fragP;fragP=fragP->fr_next) {
		printf("addr %lu  next 0x%x  fix %ld  var %ld  symbol 0x%x  offset %ld\n",
 fragP->fr_address,fragP->fr_next,fragP->fr_fix,fragP->fr_var,fragP->fr_symbol,fragP->fr_offset);
		printf("opcode 0x%x  type %d  subtype %d\n\n",fragP->fr_opcode,fragP->fr_type,fragP->fr_subtype);
	}
	fflush(stdout);
	return 0;
}
#endif

#ifdef DONTDEF
/*VARARGS1*/
panic(format,args)
char *format;
{
	fputs("Internal error:",stderr);
	_doprnt(format,&args,stderr);
	(void)putc('\n',stderr);
	as_where();
	abort();
}
#endif
